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If you add calciumhydrogencarbonate. Gypsum will be formed and you have it back.Na2SO4 + Ca(HCO3)2 => CaSO4 + 2 NaHCO3
But you also can absorb the SO2 directly on calciumcarbonate. No sodium(hydrogen)carbonate necessary.
This is the solvay process to make sodiumcarbonate from sodiumchloride basically. Nothing to do with Sulphurdioxide.https://en.wikipedia.org/wiki/Solvay_process
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